如何使用getServerSideProps使用next-iron-session实现身份验证，而不在每个页面上包含相同的代码

npm install next-iron-session iron session

import { withIronSession } from "next-iron-session";

async function handler(req, res) {
  // 处理用户登录逻辑，验证用户名和密码

  // 如果验证成功，创建一个会话
  req.session.set("user", { username: "example" });
  await req.session.save();

  res.send("登录成功");
}

export default withIronSession(handler, {
  password: "your-password",
  cookieName: "your-cookie-name",
  cookieOptions: {
    secure: process.env.NODE_ENV === "production",
  },
});

import { withIronSession } from "next-iron-session";

function ProtectedPage({ user }) {
  return <div>欢迎, {user.username}!</div>;
}

export const getServerSideProps = withIronSession(async ({ req, res }) => {
  const user = req.session.get("user");

  if (!user) {
    // 如果用户未登录，重定向到登录页面
    res.setHeader("location", "/login");
    res.statusCode = 302;
    res.end();
    return { props: {} };
  }

  return {
    props: { user },
  };
});

export default ProtectedPage;